Skip to main content

About this free course

Become an OU student

Download this course

Share this free course

Potable water treatment
Potable water treatment

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

4.14.2 Reverse osmosis

This technique, explained in Section 4.8.1, is rapidly becoming a major means of desalination, with research producing membranes with lower operating pressures (and hence lower operating costs). Originally a pressure of 14 × 106 Pa was needed to separate pure water from sea water but with newer membranes only half this pressure is required. Reverse osmosis membranes operate at ambient temperature, in contrast to multistage flash distillation, and this lower temperature minimises scaling and corrosion problems. To prevent problems with organic fouling of the membrane, pretreatment of the feed water is required.